Jack47 wrote:
I’ve seen a lot on line in reviews but would like advice from Hoggers.
What do you use and why? Using on a D7000. Thanks
BTW. What is the difference in a 50 mm prime and a 50 mm macro or Micro?
Your D7000 has a focusing motor in the camera. Because of that, the Tokina AT-X Pro 100mm f/2.8 Macro lens might be a good option. It's one of the most affordable macro lenses, but it's a "motorless" design (like some Nikkors) that relies upon the in-camera motor to autofocus. As a result, on Nikon's "below" the D7000-series, it's manual focus only. But on your camera, no problem.... it will be able to autofocus. I think the current price is in the $350 range for the Tokina 100mm.
The Tokina doesn't have image stabilization, like the Nikkor AF-S 105mm f/2.8 VR does.... for a tad over $800.
Sigma also offers a 105mm f/2.8 Macro lens, with "OS" images stabilization, currently on sale for under $500 (a big discount from the nearly $1000 list price).
Tamron offers two 90mm f/2.8 Macro lenses... A cheaper one for about $450 doesn't have images stabilization, is non internal focusing and uses a slower micro motor type of focus drive. A more expensive one (about $650) has "VC" image stabilization, is internal focusing (IF) and uses faster USD autofocus drive.
All the above lenses are able to shoot full 1:1 (life size) macro. That means that on a camera like the D7000, with an APS-C sensor approx 15x23mm, you can "fill the frame" with a 15x23mm object.
The Micro-Nikkor, Sigma and one of the Tamrons have image stabilization. But, in all honesty, image stabilization isn't a great deal of help at high magnifications like macro lenses do. If you plan to use the lens a lot for non-macro purposes, the image stabilization might be something you want. But if it will primarily be used for macro work, you'd be better served using a tripod or at least a monopod.
The Nikkor's AF-S, Sigma's HSD and one of the Tamron's USD are all faster "ultrasonic" type autofocus drive. The other lenses use slower micro motors. However, don't expect any good macro lens to be particularly fast focusing.... Most are designed with "long throw" focus, which emphasizes precision over speed. That's because high magnification makes for very shallow depth of field effects, which in turn demands very precise focusing. A lot of macro shooters just find it easier to use manual focus, anyway. As with image stabilization, the speed of focus drive may be more important if planning to use the lens for non-macro purposes.... But don't expect a macro lens to serve for any sort of sports/action photography. They simply don't have the AF speed to quickly acquire focus or track movement, the way some non-macro lenses do.
The Nikkor, Sigma and the more expensive Tamron are Internal Focusing (IF) lenses. The Tokina and the less expensive Tamron are not. This means they don't increase in length when focused closer. That may not be a big deal with non-macro lenses and distances, but it can be with macro and close-up work. Non-IF macro lenses can double in length when focused to their highest magnification. Lenses in the 90 to 105mm range of focal lengths typically have around 12" minimum focus distance (MFD)... But that's measured from the film/sensor plane of the camera, so part of the camera and the lens itself occupy part of that space, plus anything mounted to the front of the lens. Actual working distance will be a lot less. An IF lens may be able to offer more working distance. HOWEVER, with optics there's always a trade off.... IF lenses may not increase in length, but are often longer than non-IF lenses. Also, IF lenses actually change focal length a little as they are focused closer. I don't know how this effects the three lenses mentioned above, but I know the Canon 100mm macro lens I use, which is IF, is actually closer to 70mm "true" focal length by the time it's focused to full 1:1 magnification.
There are many other macro lenses available. I've concentrated on the ones above because I believe the range of focal lengths from 90 to 105mm is a good one for "general purpose macro"... a good first or only macro lens. Shorter focal lengths put you closer to subjects, which might be useful in studio shooting small objects under controlled lighting conditions, but can be a problem in the field with live subjects or risking casting a shadow when you have less control over lighting. Longer focal lengths are available too, but are a lot harder to hold steady and more likely to require using a tripod or at least a monopod. They also tend to be a lot pricier.
The LAST thing you have to worry about with most macro lenses is image quality. Virtually all of them are among the sharpest lenses made.
As to your second question....
There are a number of differences between a 50mm "standard" lens and a 50mm "macro". The standard lens is optimized to focus at a distance of around 8 feet or more. There's actually some curvature to the plane of focus at that distance, though the lens' depth of field probably hides most of it and the lens doesn't need any "correction". A 50mm macro lens, on the other hand, is designed to focus to about 8
inches and there's almost no curvature to the plane of focus that close. As a result, most macro lenses are "flat field" designs, optimized and corrected for this because depth of field can be super shallow.
As mentioned above, the non-macro lens is also likely to have faster focus (be it manual or auto).... the focus ring may only need to be rotated 120 degrees to go all the way from infinity to the lens' closest focus. To deal with super shallow depth of field and the need for more accurate focusing, a macro lens' focus ring might rotate 240 degrees or more, for more precision, but less speed.
It's also not uncommon for standard 50mm lenses to have fairly large maximum apertures.... f/1.8, f/1.4 and even f/1.2 are available. Most of those have a minimum aperture of f/16 or, in a few cases, f/22. A 50mm macro more typically is has a max aperture of f/2.8 or smaller... and it's not uncommon for them to be able to stop down to f/22 or even f/32.
Some macro lenses also have a "Focus Limiter", which is used to help speed up focus performance in certain situations. For example, you might restrict the lens to focus only within close-up distances, so that it doesn't go hunting for focus farther away... or vice versa. You see these on all the lenses listed above. Focus limiters are also fairly common on telephoto lenses. But you rarely see them on non-macro lenses with shorter focal lengths like 50mm.